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Whole-genome sequencing then revealed the outbreak was related to cases from the Bankstown cluster.
But the person who introduced the infection to City Tattersalls has not been identified,NSW Health said.
In a sign things may be returning to normal,NSW Premier Gladys Berejiklian has welcomed her parents over to her home for the first time since the beginning of the pandemic.
The Premier shared the heartwarming moment via social media,uploading a picture of her family social distancing during a Father's Day visit on Sunday night."First time I’ve had my parents over to my place during COVID,"she wrote."Happy Father’s Day to all the dads across NSW!"
Meanwhile,NSW's first major COVID-19 outbreak linked to Victoria’s second wave has officially been"closed"by health authorities.
There have been no new cases linked to the Crossroads Hotel at Casula since August 1,and two incubation periods have passed since the last case.
“There is no ongoing public health risk. This cluster is now closed,” the latest NSW Health surveillance report says.
NSW has 11 active clusters,eight of which haven’t reported new cases for more than a week.
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Meanwhile,Victoria reported 63 new cases and five deaths on Sunday as Premier Daniel Andrews revealed his five-step roadmap to'COVID-normal',which includes extending the stage four lockdown for at least another fortnight.
There are 90 COVID-19 patients being treated by NSW Health,including seven in intensive care.
NSW's COVID-19 case fatality rate is less than half that of the global average,the surveillance report suggested.
The 54 deaths in NSW account for 1.4 per cent of all confirmed cases reported up to 29 August,compared to the international estimated case fatality rate of 3.4 per cent.
Of those who have died in NSW,67 per cent were aged 80 or older,24 per cent were in their 70s,7 per cent were in their 60s and one person was in his 50s.
NSW reports similar fatality rates to South Korea (1.6 per cent) and New Zealand (1.6 per cent),while Italy,the United Kingdom and Spain reported significantly higher mortality rates (13.3 per cent,12.5 per cent and 6.6 per cent respectively).
The surveillance report also found the vast majority of NSW's COVID-19 cases reported only mild symptoms when they were first interviewed by NSW Health personnel.
NSW's most common COVID-19 symptoms
Coughing was the most common symptom (58 per cent of cases) followed by fatigue (55 per cent),headache (47 per cent),fever (39 per cent) and a sore throat (37 per cent).
But one in five cases reported severe respiratory symptoms,including pneumonia,shortness of breath or acute respiratory disease. They were most common in elderly cases.
Young children were more likely to report no symptoms than adults.
Among children aged under five,cough was the most common symptom (38 per cent) followed by runny nose (34 per cent),fever (32 per cent),diarrhoea or nausea and vomiting (26 per cent).
Primary school-aged children (five to 11 year-olds) reported having a runny nose (37 per cent),headache (30 per cent),cough (29 per cent),sore throat (24 per cent) and fever (22 per cent).
High school-aged children (12 to 17-year-olds) had cough (44 per cent),headache (43 per cent),runny nose (43 per cent),sore throat (41 per cent) and fatigue (36 per cent).
Adults aged between 18 and 79 had the same top five symptoms of cough,fatigue,headache,fever and sore throat,sometimes in varying order.
Older adults (aged over 80) had cough (66 per cent),fatigue (42 per cent),fever (37 per cent),shortness of breath (26 per cent) and diarrhoea and/or nausea and vomiting (24 per cent).
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